URL Encoding. URLs can only be sent over the Internet using the ASCII character-set. Since URLs often contain characters outside the ASCII set, the URL has to be converted into a valid ASCII format. URL encoding replaces unsafe ASCII characters with a "%" followed by two hexadecimal digits.
var URLEncode = function (c) {
var o = '';
var x = 0;
c = c.toString();
var r = /(^[a-zA-Z0-9_.]*)/;
while (x < c.length) {
var m = r.exec(c.substr(x));
if (m !== null && m.length > 1 && m[1] !== '') {
o += m[1];
x += m[1].length;
}
else {
if (c[x] == ' ') {
o += '+';
}
else {
var d = c.charCodeAt(x);
var h = d.toString(16);
o += '%' + (h.length < 2 ? '0' : '') + h.toUpperCase();
}
x += 1;
}
}
return o;
};